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Private networks offer superior security. You own the wires, so you have control over what they’re used for, who can use them, and what kind of data passes over them. However, they’re not very flexible, because they require you to configure and manage costly leased lines between remote locations. To make things worse, most private networks face a dilemma: Implementing enough capacity to handle peak loads almost guarantees that much of that capacity will sit idly much of the time, even though it still has to be paid for.

One way to work around this problem is to maintain private dial-up services. Such services allow, for example, a field rep in Chicago to dial the home office in Boston. But dial-ups are expensive, ...

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